ethers.js/misc/admin/src.ts/cmds/link.ts

import fs from "fs";
import { dirname, resolve } from "path";

import { getDependencies } from "../local";
import { colorify } from "../log";
import { dirs, getDirname, getPackagePath, packages } from "../path";
import { mkdir } from "../utils";

function link(existing: string, path: string): void {
    try {
        const current = fs.readlinkSync(path);

        // Alerady linked
        if (current === existing) { return; }

        fs.unlinkSync(path);
    } catch (error) {
        if (error.code !== "ENOENT") { throw error; }
    }

    // Link
    const dir = dirname(path);
    mkdir(dir);
    fs.symlinkSync(existing, path, "junction");
}

(async function() {
    console.log(colorify.bold(`Linking ${ packages.length } package node_modules rat nests...`));

    const nodeModulesBase = resolve(dirs.root, ".package_node_modules");

    // Make a symlink in the ROOT/node_modules to each package in this repo
    packages.forEach((name) => {

        // e.g. /node_modules/@ethersproject/abi => /packages/abi
        link(getPackagePath(name), resolve(dirs.root, "node_modules", name));

        // e.g. /packages/abi/node_modules => /.package_node_modules/abi/
        const nodeModules = resolve(nodeModulesBase, getDirname(name));
        mkdir(nodeModules);
        link(nodeModules, resolve(getPackagePath(name), "node_modules"));
    });

    packages.forEach((name) => {
        const nodeModules = resolve(nodeModulesBase, getDirname(name));

        const deps = getDependencies(name);
        Object.keys(deps).forEach((name) => {
            link(resolve(dirs.root, "node_modules", name), resolve(nodeModules, name));
        });
    });

})().catch((error) => {
    console.log(`Error running ${ process.argv[0] }: ${ error.message }`);
    process.exit(1);
});;